The Kennedy clan has hit the slopes in Aspen, Colo., with a blowout 25th birthday party for Summer Kennedy.

The bash at Snow Lodge for the granddaughter of Robert Kennedy and daughter of Max Kennedy attracted family including Kyra, Kiki, Kerry and Kiley Kennedy and Cara Kennedy Cuomo.

Summer — whose full name is Caroline Summer Rose Kennedy — is best known to New York Post readers for sticking out her tongue and allegedly drunkenly telling cops, “F - - k off!” when she was busted in 2017 at a raging house party near the Kennedy dynasty’s historic Hyannis Port, Mass., compound.

But Aspen sources say her birthday bash just before New Year’s Eve was a much more restrained affair, with “all of the grown-ups in the room,” including Max, uncle Bobby Kennedy Jr. and wife Cheryl Hines, and Anthony Shriver.

On the same day also at Snow Lodge, designer Nicole Miller launched her new rosé, with guests including Brian Atwood, Renee Rockefeller, Helen Lee Schifter and Crystal Lourd.